After you file

"She did claim herself last year but she is still a minor and I’m claiming her as my dependent this year."

 

You get the child tax credit if she did not turn 18 before the end of 2021.   If she turned 18 in 2021 you cannot get the CTC.

 

But tell us more about "she claimed herself..."  ---- Did you get that sorted out when it happened?   Did she amend her return and did you file your own return by mail for 2020 to claim her?   

**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**